disk extend problem

hello friends

today i saw that "/var/log %100(260gb)". i decided that add new disk(250gb). i added new disk according to sk94671. at the end system said that "lv_log size can be 20gb to 282gb". and i wrote to 282gb. but end of the process i saw that "/var/log/ %93". oppss it should have been min %50. how can i fix it?